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You'll love meetup.com! It's free to join, but if you start your own group, you'll have to pay a monthly fee. There are tons of groups on there for just about everything! It's awesome!

Some people are just selfish and thoughtless. So don't take things to personally when they flake on you. Just be glad that they showed you their true self before you wasted any time on them- I get the impression that you're young. If so, just know that a lot of younger people are more self centered and they don't often take other people's feelings into consideration at times. I'm not saying they're all like that, but that's the way that they are in general. Sadly, even older people can be the same way-

Just keep on being friendly and reach out to people, but know when to give them space. They'll usually make it obvious by their actions and what they do or don't do. You just have to know how to read between the lines sometimes.